Another important feature is the wave propagation velocity increased with depth in layered media. It ensures
that there is a sufficient accuracy of the speed and depth of the layers. There are several different kinds of
seismic waves, and they all move in different ways. The two main types of waves are body waves and surface
waves. Body waves can travel through the earth's inner layers, but surface waves can only move along the
surface of the planet likeripples on water. Earthquakes radiate seismic energy as both body and surface
waves